低功耗微控制器(Energy Micro)公司的32位處理器EFM32 Gecko系列產品采用ARM Cortex-M3內核,工作頻率高達32MHz.系列產品具有低電流特性，配合2µs的喚醒時間，使其至少增加了4倍的電池使用壽命。啟動模式下從閃存FLASH執行代碼所消耗的典型電流為160µA/MHz、深度睡眠模式和關斷模式下分別為900nA和20nA。主要用在不斷發展的智能儀表市場和對功耗敏感的應用，如樓宇自動化、安防系統和便攜式健康醫療及健身設備。本文介紹了EFM32 Gecko系列主要特性,方框圖和EFM32-G2XX-DK開發板主要特性與詳細的電路圖.

The EFM32 MCUs are the world’s most energy friendly microcontrollers. With a unique combination of the powerful 32-bit ARM Cortex-M3, innovative low energy techniques, short wake-up time from energy saving modes, and a wide selection of peripherals, the EFM32G microcontroller is well suited for any battery operated application as well as other systems requiring high performance and low-energy consumption.

This section gives a short introduction to each of the modules in general terms and also and shows a summary of the configuration for the EFM32G232 devices.

The ARM Cortex-M3 includes a 32-bit RISC processor which can achieve as much as 1.25 Dhrystone MIPS/MHz. A Memory Protection Unit with support for up to 8 memory segments is included, as well as a Wake-up Interrupt Controller handling interrupts triggered while the CPU is asleep.

EFM32 Gecko系列主要特性:

• ARM Cortex-M3 CPU platform

• High Performance 32-bit processor @ up to 32 MHz

• Memory Protection Unit

• Wake-up Interrupt Controller

• Flexible Energy Management System

• 20 nA @ 3 V Shutoff Mode

• 0.6 μA @ 3 V Stop Mode, including Power-on Reset, Brown-out Detector, RAM and CPU retention

• 0.9 μA @ 3 V Deep Sleep Mode, including RTC with 32.768 kHz oscillator, Power-on Reset, Brown-out Detector, RAM and CPU retention

• 45 μA/MHz @ 3 V Sleep Mode

• 180 μA/MHz @ 3 V Run Mode, with code executed from flash

• 128/64/32 KB Flash

• 16/16/8 KB RAM

• 53 General Purpose I/O pins

• Configurable Push-pull, Open-drain, pull-up/down, input filter, drive strength

• Configurable peripheral I/O locations

• 16 asynchronous external interrupts

• 8 Channel DMA Controller

• 8 Channel Peripheral Reflex System for autonomous inter-peripheral signaling

• Hardware AES with 128/256-bit keys in 54/75 cycles

• Timers/Counters

• 3× 16-bit Timer/Counter

• 3×3 Compare/Capture/PWM channels

• Dead-Time Insertion on TIMER0

• 16-bit Low Energy Timer

• 24-bit Real-Time Counter

• 3× 8-bit Pulse Counter

• Watchdog Timer with dedicated RC oscillator @ 50 nA

• Communication interfaces

• 3× Universal Synchronous/Asynchronous Receiver/Transmitter

• UART/SPI/SmartCard (ISO 7816)/IrDA

• Triple buffered full/half-duplex operation

• 2× Low Energy UART

• Autonomous operation with DMA in Deep Sleep Mode

• I2C Interface with SMBus support

• Address recognition in Stop Mode

• Ultra low power precision analog peripherals

• 12-bit 1 Msamples/s Analog to Digital Converter

• 8 single ended channels/2 differential channels

• On-chip temperature sensor

• Conversion tailgating for predictable latency

• 12-bit 500 ksamples/s Digital to Analog Converter

• 2× Analog Comparator

• Capacitive sensing with up to 16 inputs

• Supply Voltage Comparator

• Ultra efficient Power-on Reset and Brown-Out Detector

• Pre-Programmed Serial Bootloader

• Temperature range -40 to 85 ºC

• Single power supply 1.8 to 3.8 V

• LQFP64 package


圖1. EFM32 Gecko系列方框圖

EFM32-G2XX-DK開發板

The EFM32-G2XX-DK is a highly flexible development kit. It offers many features and peripherals to the EFM32 through jumperless configuration. The different features on the kit are available as configured in the motherboard’s Board Controller. Configuration is easily done by a simple API in the kit Board Support Package.

If none of the motherboard features are needed, configuration of the Board Controller is not necessary.

All EFM32 GPIO pins are available on the prototyping board.

EFM32-G2XX-DK開發板主要特性:

• Advanced Energy Monitoring system for precise current tracking.

• Special hardware configuration for isolation of the MCU power domain.

• Replaceable prototyping board for quick custom application development.

• Full feature USB debugger / emulator with debug out functionality.

• 3.5-inch TFT-LCD 320x240 pixel RGB color display.

• Board Controller for board configuration / signal routing.

• Single ended and differential ADC inputs.

• Line-in stereo audio input amplifier.

• Line-out stereo audio output amplifier.

• 2 RS232 connectors.

• 3-axis accelerometer.

• SPI Flash and microSD card reader (SPI mode).

• EEPROM.

• Temperature sensor.

• IrDA tranceiver.

• 256Kx16bit / 512KB parallel bus SRAM.

• 2Mx16 / 4MB parallel bus NOR Flash.
• Ambient light sensor and potmeter.

• 5 way joystick.

• 4 User buttons, 8-bit DIP switch and 16 user LEDs.

圖2.EFM32-G2XX-DK開發板外形圖

圖3.EFM32-G2XX-DK開發板方框圖

圖4.EFM32-G2XX-DK開發板電路圖(1)

圖5.EFM32-G2XX-DK開發板電路圖(2)

圖6.EFM32-G2XX-DK開發板電路圖(3)

圖7.EFM32-G2XX-DK開發板電路圖(4)

圖8.EFM32-G2XX-DK開發板電路圖(5)

圖9.EFM32-G2XX-DK開發板電路圖(6)

圖10.EFM32-G2XX-DK開發板電路圖(7)

圖11.EFM32-G2XX-DK開發板電路圖(8)

圖12.EFM32-G2XX-DK開發板電路圖(9)

圖13.EFM32-G2XX-DK開發板電路圖(10)


圖14.EFM32-G2XX-DK開發板電路圖(11)

圖15.EFM32-G2XX-DK開發板電路圖(12)

圖16.EFM32-G2XX-DK開發板電路圖(13)

圖17.EFM32-G2XX-DK開發板電路圖(14)

圖18.EFM32-G2XX-DK開發板電路圖(15)

圖19.EFM32-G2XX-DK開發板電路圖(16)

圖20.EFM32-G2XX-DK開發板電路圖(17)

圖21.EFM32-G2XX-DK開發板電路圖(18)

圖22.EFM32-G2XX-DK開發板電路圖(19)

圖23.EFM32-G2XX-DK開發板電路圖(20)
詳情請見:
http://cdn.energymicro.com/dl/devices/pdf/d0069_efm32g232_datasheet.pdf